Patent US2819174A successfully refreshed from Google Patents.
US2819174A
Expired / Lapsed
US
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Stable aqueous titania monohydrate dispersions
Assignee: Wyeth Holdings LLC
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Filing: 1953-11-25
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Granted: 1958-01-07
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Expires: 1973-11-25
Abstract
No abstract record available.
Inventors
- 👤 Richard D Vartanian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:53
CPC Classifications
C; C09; C09D; C09D17/00; C09D17/004; C09D17/007; C09D17/008; D; D06; D06M; D06M11/00; D06M11/32; D06M11/36; D06M11/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A PROCESS WHICH COMPRISES ACIDIFYING A SUBSTANTIALLY SULFATE-ION-FREE AQUEOUS SUSPENSION OF TITANIA HYDRATE TO A PH BELOW ABOUT 5 WITH A MONOBASIC INORGANIC ACID AND THEREAFTER CHANGING THE PH OF THE SUSPENSION TO A VALUE BETWEEN 5 AND 11 WITH AN ALKALIZING AGENT OF THE GROUP CONSISTING OF WATER-SOLUBLE ACYCLIC ALKYL MONOAMINES, WATER-SOLUBLE ACYCLIC ALKANOL MONOAMINES, WATER-SOLUBLE AMINES IN STOICHIOMETRIC EXCESS IN COMBINATION WITH WATER-SOLUBLE ALIPHATIC ACIDS, AND WATER-SOLUBLE AMINES IN STOICHIOMETRIC EXCESS IN COMBINATION WITH WATER-SOLUBLE POLYBASIC INORGANIC ACIDS TO PRODUCE A STABLE COLLOIDAL SUSPENSION OF CHARGED TITANIA MONOHYDRATE PARTICLES HAVING A SUBSTANTIALLY UNIFORM PARTICLE SIZE LESS THAN ABOUT 0.1 MICRON.
Claim 2
Dependent Claim
102 words
A PROCESS WHICH COMPRISES ACIDIFYING A SUBSTANTIALLY SULFATE-ION-FREE AQUEOUS SUSPENSION OF TITANIA HYDRATE TO A PH BELOW ABOUT 5 WITH A MONOBASIC INORGANIC ACID AND THEREAFTER CHANGING THE PH OF THE SUSPENSION TO A VALUE BETWEEN 5 AND 11 WITH AN ALKALIZING AGENT OF THE GROUP CONSISTING OF WATER-SOLUBLE ACYCLIC ALKYL MONOAMINES, WATER-SOLUBLE ACYCLIC ALKANOL MONOAMINES, WATER-SOLUBLE AMINES IN STOICHIOMETRIC EXCESS IN COMBINATION WITH WATER-SOLUBLE ALIPHATIC ACIDS, AND WATER-SOLUBLE AMINES IN STOICHIOMETRIC EXCESS IN COMBINATION WITH WATER-SOLUBLE POLYBASIC INORGANIC ACIDS TO PRODUCE A STABLE COLLOIDAL SUSPENSION OF CHARGED TITANIA MONOHYDRATE PARTICLES HAVING A SUBSTANTIALLY UNIFORM PARTICLE SIZE LESS THAN ABOUT 0.1 MICRON.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-06 | 1961-07-08 | 1962-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-06 | 1965-07-08 | 1966-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-06 | 1969-07-08 | 1970-01-07 | $7700.00 | Window Closed / Lapsed |